. Botany; an elementary text for schools. Plants. EQUISETUMS—IROETES 193 close proximity, will be easily understood. As in the fern, the fertil- ized egg-cell develops into an equisetum plant. The sterile shoots, Fig. 342, st, appear much later in the season. They give rise to repeated whorls of angular or furrowed branches. The leaves are very much reduced scales, situated at the internodes. The stems are provided with chlorophyll and act as assimilrting. 342. Equisetum urvense; s<, sterile slioot; /, fertile shoot showing the spike at rt; i, sporophyll, with sporangia; s, spore. tissue, n
. Botany; an elementary text for schools. Plants. EQUISETUMS—IROETES 193 close proximity, will be easily understood. As in the fern, the fertil- ized egg-cell develops into an equisetum plant. The sterile shoots, Fig. 342, st, appear much later in the season. They give rise to repeated whorls of angular or furrowed branches. The leaves are very much reduced scales, situated at the internodes. The stems are provided with chlorophyll and act as assimilrting. 342. Equisetum urvense; s<, sterile slioot; /, fertile shoot showing the spike at rt; i, sporophyll, with sporangia; s, spore. tissue, nourishing the rhizome and the fertile shoots. Nutriment is also stored in special tubers developed on the rhizome. Other species of equisetum have only one kind of shoot—a tall, hard, leafless, green shoot with the spike at its summit. Equisetum stems are full of silex and they are sometimes used for scouring floors and utensils: hence the common name " scouring ; ISOETES Isoetes or quillworts are usually found in water or damp soil on the edges of ponds and lakes. The general habit of a plant is seen in Fig. 343, a. It consists of a short, perennial stem bearing numer- ous erect, quill-like leaves witli broad sheathing bases. The plants are commonly mistaken for young Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bailey, L. H. (Liberty Hyde), 1858-1954. New York, Macmillan Co.
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